P4 第2冊 常作 3空氣的探究
Authored by Gs SAS
Social Studies
4th Grade
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11 questions
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1.
DRAG AND DROP QUESTION
45 sec • 15 pts
氣球內充滿了空氣。空氣佔有 (a) ，但沒有固定的
(b) 。
2.
DRAG AND DROP QUESTION
45 sec • 15 pts
食物包裝袋內的 (a) 被抽出，袋外的空氣 (b) 比袋內的大，使袋裏的食物能夠被密封。
3.
MULTIPLE CHOICE QUESTION
20 sec • 5 pts
風是由空氣___而形成的。
流動
震動
滾動
搖動
移動
4.
DRAG AND DROP QUESTION
45 sec • 15 pts
人們燃點燒烤爐火時，為甚麼會在爐旁搧風？
這樣做會令空氣 (a) ，從而增加 (b) 的供應，有助爐火燃燒。
5.
MULTIPLE CHOICE QUESTION
20 sec • 10 pts
為甚麼燒烤過的炭不能恢復原狀？
因為燃燒是____的改變。
不可逆轉
可以逆轉
不可倒轉
不可反轉
可以倒轉
6.
MULTIPLE CHOICE QUESTION
20 sec • 10 pts
為甚麼防火沙倒在火種上，可以幫助滅火？
因為防火沙把___和火種隔開，使火種熄滅。
氧
氮
氯
二氧化碳
水
7.
MULTIPLE CHOICE QUESTION
20 sec • 5 pts
空氣中，氧約佔所有氣體的___。
五分之一
五分之二
二分之一
四分之一
三分之一
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